#include <48func.h>
void handler(int signum){
    printf("before, signum = %d\n", signum);
    sleep(5);
    printf("after, signum = %d\n", signum);
}
int main(int argc, char *argv[])
{
    signal(SIGINT,handler);
    signal(SIGQUIT,handler);
    while(1){

    }
    return 0;
}

